Magnetic order in freshwater ferromanganese nodules. Coey, J., M., D. & Schindler, D., W. Physica, 86-88B:823-824, 1977.
Magnetic order in freshwater ferromanganese nodules. [pdf]Paper  abstract   bibtex   
A set of eight ferromanganese concretations whose crystallinity deteriorates with increasing manganese content all order magnetically well above 4.2 K. The series presents a continous evolution from antiferromagnetic order in the iron-rich members, composed essentially of cristalline goethite, to speromagnetic order in the manganese-rich ones, which are amorphous.

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